The New Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 193
... quartz , sugar , and tourma- line . If a pencil mark is covered with a piece of glass , only one image will be seen ; but if a calcite crystal oriented in a certain direction is substituted , two marks will be observed ; or , if a ...
... quartz , sugar , and tourma- line . If a pencil mark is covered with a piece of glass , only one image will be seen ; but if a calcite crystal oriented in a certain direction is substituted , two marks will be observed ; or , if a ...
Page 563
... quartz oscillators ; his investigations culminated in the quartz ring clock ( 1938 ) . During World War II he invented a number of radio - wave measuring devices that led him in 1950 to measure the speed of light as 299,792.5 ± 1 km ...
... quartz oscillators ; his investigations culminated in the quartz ring clock ( 1938 ) . During World War II he invented a number of radio - wave measuring devices that led him in 1950 to measure the speed of light as 299,792.5 ± 1 km ...
Page 916
... quartz , glass ) ; even ( rough , approximately plane surfaces ) ; un- even ( rough and completely irregular surfaces , Slate , a metamorphic rock , showing typical splintery fracture and thin layering ( slightly larger than life size ) ...
... quartz , glass ) ; even ( rough , approximately plane surfaces ) ; un- even ( rough and completely irregular surfaces , Slate , a metamorphic rock , showing typical splintery fracture and thin layering ( slightly larger than life size ) ...
Contents
14 written for Catherine the Great Observations | 14 |
Consult the INDEX first | 581 |
Didius Julianus marble bust in | 703 |
Copyright | |
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